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Deferred revenue - Rollforward (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Oct. 28, 2017
Oct. 29, 2016
Oct. 28, 2017
Oct. 29, 2016
Sterling Jewelers        
Deferred Revenue Warranty [Roll Forward]        
ESP deferred revenue, beginning of period $ 732.7 $ 720.3 $ 737.4 $ 715.1
Plans sold 47.9 52.8 176.7 190.4
Revenue recognized (63.0) (62.9) (196.5) (195.3)
ESP deferred revenue, end of period 717.6 710.2 717.6 710.2
Zale        
Deferred Revenue Warranty [Roll Forward]        
ESP deferred revenue, beginning of period 169.5 156.2 168.2 146.1
Plans sold 25.0 28.3 89.6 100.8
Revenue recognized (29.3) (29.3) (92.6) (91.7)
ESP deferred revenue, end of period $ 165.2 $ 155.2 $ 165.2 $ 155.2